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1
Grease and flour a 9 inch x 9 inch x 2 inch baking pan; set aside.
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2
Stir together flour and baking powder; set aside.
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3
In a mixing bowl beat eggs with an electric mixer on high speed about 4 minutes or till thick.
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4
Gradually add sugar, beating on medium speed for 4 to 5 minutes or till light and fluffy.
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5
Add the dry mixture; beat on low to medium speed just till combined.
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6
In a small saucepan heat and stir milk and butter till butter melts; add to batter, beating till combined.
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7
Pour batter into the prepared pan.
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8
Bake in a 350 degree (175 C.) oven for 20 to 25 minutes or till a wooden toothpick comes out clean.
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9
Cool for 10 minutes in pan; remove cake from pan.
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10
Cool cake completely.
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11
In small saucepan combine granulated sugar, espresso powder or coffee crystals, and 1/3 cup (80 ml) water.
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12
Cook over medium heat to boiling.
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13
Boil for 1 minute; remove from heat and stir in rum.
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14
Cool completely.
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15
In a medium bowl stir together the mascarpone or cream cheese, powdered sugar, and vanilla.
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16
Stir in the 2 ounces grated chocolate.
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17
Cut cake horizontally into 3 layers.
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18
Return a cake layer to the baking pan.
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19
Brush layer in pan with one-third of the syrup and spread with half of the filling.
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20
Repeat layering with the second cake layer, one-third syrup, and remaining filling.
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21
Top with the third cake layer; brush with remaining syrup.
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22
In a chilled bowl combine whipping cream and coffee liqueur.
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23
Beat with chilled beaters of an electric mixer on medium speed till soft peaks form.
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24
Spread whipped cream over top cake layer; sprinkle with the 1/2 grated chocolate.
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25
Refrigerate at least 4 hours before serving.